Federal authorities and local police today are scouring James Holmes' apartment for evidence as a newly released video gives some insight into the man who allegedly killed 12 people and injured 58 people at a packed screening of the latest Batman movie, "The Dark Knight Rises."

Overnight, ABC News obtained exclusive video and photos of Holmes. The video was recorded six years ago when Holmes was 18.

In the video, he is standing among his peers at a science camp at Miramar College in San Diego talking about "temporal illusions."

"Over the course of the summer I've been working with a temporal illusion. It's an illusion that allows you to change the past," Holmes said in the video.

He appears slightly nervous speaking to the group but also extremely intelligent.

By most accounts, Holmes lived the life of a normal teen – with a particular interest in science.

This was how he was introduced at the seminar: "His goals are to become a researcher and to make scientific discoveries. In personal life, he enjoys playing soccer and strategy games and his dream is to own a slurpee machine."

Though Holmes was apparently a gifted scientist who had received a federal grant to work on his Ph.D. at one of the most competitive neuroscience programs in the country, he was a loner who -- oddly for a young scientist -- seemed to have no Internet presence.

Officials Saturday said they now have "evidence of calculation and deliberation," in the way he allegedly planned and prepared for the shooting, beginning to buy weapons and ammunition two months ago.

Holmes is originally from San Diego, where he once reportedly worked as a camp counselor for underprivileged children. He was an honors student at Westview High School, but did not walk in his graduation ceremony.

Holmes, 24, is currently in custody for Friday's massacre in Aurora, Colo.

Dressed in full riot gear, Holmes allegedly entered from an emergency exit in the front right corner of the theater before releasing something that witnesses identify as tear gas or a smoke bomb. From there, he allegedly sprayed the sold-out theater with a storm of bullets, injuring and killing both adults and children.

Among the dead include: Micayla Medek, 23; Alex Sullivan, 27, who was attending the movie for his birthday; Ohio native Matt McQuinn; Alex Teves, 24; Alexander J. Boik, 18; Rebecca Ann Wingo, 32; and Gordon W. Cowden, 51.

Two other people died at the hospital, including 24-year-old aspiring sportscaster Jessica Ghawi. Police said 30 people remained hospitalized with 11 of them in critical condition. Bullets from the shooting spree tore through the theater and into adjoining theaters, where at least one other person was struck and injured.

John Larimer, a member of the Navy, was also confirmed by his family to be among the dead. The family said they were notified at their Illinois home around midnight today by a Navy notification team that Larimer was dead.

Staff Sgt. Jesse Childress was an Air Force reservist assigned to units at Buckley Air Force Base in Colorado was killed in the shooting. He was 29. Air Force Lt. Col. Pat Walsh said that Childress was respected in the 310th Force Support Squadron.

Military veteran Jonathan T. Blunk of Aurora, Colo., was killed as he threw himself over a friend to keep her from getting shot. The 26-year-old worked at a hardware store.